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The term is cultural, not technical. From Wikipedia: There is no standard for defining the term, and some difference of opinion is possible as to the degree to which a given operating system or ...
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#1: Initial revision
The term is cultural, not technical. From [Wikipedia](https://en.wikipedia.org/wiki/Unix-like): > There is no standard for defining the term, and some difference of opinion is possible as to the degree to which a given operating system or application is "Unix-like". There do exist standards, most notably the various POSIX standards and the Single UNIX Specification, which can be used as a rough gauge for whether a system is Unix-like. But an OS doesn't have to conform perfectly to those standards to be considered a *nix. Conversely, compatibility layers that implement those standards can be implemented for OSes that are generally not considered *nices. Ultimately, like many cultural terms, the real definition of a *nix is something that is similar enough, in whatever ways matter most in context, to all the other things that we call *nices.